Reentrant superspin glass state and magnetization steps in the oxyborate Co2AlBO5

Article

关键词: FE X O2BO3;    SPIN-GLASS;    LUDWIGITE;    PHASE;    TRANSITION;    FE3O2BO3;    CO3O2BO3;    CRYSTAL;    COBALT;    IRON;   

DOI  :  10.1103/PhysRevB.95.144409

来源: SCIE

【 摘 要 】

An oxyborate Co2AlBO5 belonging to the ludwigite family is investigated using structural, thermodynamic, dielectric, and magnetic measurements. Magnetic measurements indicate that this system is seen to exhibit long-range magnetic ordering at T-N = 42 K, signatures of which are also seen in the specific heat, dielectric susceptibility, and lattice parameters. The absence of a structural phase transition down to the lowest measured temperatures distinguishes it from the more extensively investigated Fe-based ludwigites. At low temperatures, the system is seen to stabilize in a reentrant superspin glass phase at T-G = 10.6 K from within the magnetically ordered state. This ground state is also characterized by magnetic-field-induced metamagnetic transitions, which at the lowest measured temperatures exhibit a number of sharp magnetization steps, reminiscent of that observed in the mixed valent manganites.

【 授权许可】

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